Through a uniform B field, A small rectangular loop is moving towards left with constant velocity as shown in the figure. Counting of time t begins at the moment, the loop starts entering the field.
Plot the variation of flux through the loop with respect to time. Also, plot the variation of induced emf w.r.t. time t.

Explanation

Since the loop is moving with constant velocity, the flux will be increasing linearly so long as the loop will be entering the B field. Once the loop has completely entered the B field the flux will become constant. Now when the loop will start coming out the flux will linearly decrease to zero value.

Since emf induced `epsilon=-(d phi)/(dt)`, it means emf is negative of the slope of the `phi-t` graph. So, emf is negative constant in the beginning, then it becomes zero and then it becomes positive constant and again it becomes zero.